Liquid proportioning and spraying apparatus



March 18, 1952 D. G. GRISWOLD LIQUID PROPORTIONING AND SPRAYING APPARATUS Filed July 22, 1946 3 Sheets-Sheet 1.

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March 18, 1952 D. G. GRISWOLD 3 Sheets-Sheet 2 March 18, 1952 D. G. GRISWOLD 2,590,007

LIQUID PROPORTIONING AND SPRAYING APPARATUS Filed July 22, 1946 3 Sheets-Sheet :5

E v P0 0 +w m: w: M u 3 Q \Q 6 mi e: MN 7 hll +2 5 m: 1T mm. mm K2 w\ Q 3 3 d M Q a 5 m wh H a 5 0 p m X Q3 MM '1 m M un E m v Mm h I mm mm WW I M% Q am 0 m: w N w a: QM Q ll :3 m \m\ mm u a g Q W\ NW mm am +5 w 51 m5 5 vi U QMM Q: n m p E E n g F U Patented Mar. 18, 1952 LIQUID PROPORTIONING AND SPRAYING APPARATUS Donald G. Griswold, San Marino, Calif.

Application July 22, 1946, Serial No. 685,396

19 Claims. (01. 299-84) The present invention relates to liquid proportioners, and more particularly to a liquid proportioner of general utility that will continuously deliver a mixture of at least two liquids in a desired constant volumetric ratio.

The invention further relates to a liquid proportioner which is adjustable to vary the ratio of the volumes of the liquids in the mixture delivered thereby.

The invention further relates to a combined proportioning and spraying apparatus especially suitable for accurately mixing prescribed volumes of at least two liquids for various spray applications. As one illustrative use of the invention, precise relative volumes of raw water and liquid fertilizer, or any chemical solution, may be concurrently mixed and sprayed for agricultural, horticultural, or insecticidal purposes.

The invention still further relates to a novel, positive displacement pump adapted to be operatively associated with one cylinder of a multicylinder hydraulic motor operated by water under pressure, and to be actuated on its working stroke by a piston of said motor for pumping a given volume of treating liquid into the stream of water exhausted from said motor and mixed therewith. This feature eliminates the necessity of providing large storage tanks for mixing measured volumes of the treating liquid and water prior to spraying.

Various chemical compounds in the form of fertilizers, plant foods, insecticides, etc., have made their appearance on the market, but their general and widespread use has been retarded largely because of inadequate means for'readily and conveniently mixing the same with water in uniform, fixed proportions for effective spray application to lawns, plants, trees, shrubs, etc. As is well known, if certain treating mixtures are too strong, they will injure or burn the vegetation, and if they are too weak, their efiectiveness is lost. The present invention overcomes the existing problems by providing means whereby a treating liquid of any given concentration can be readily mixed with water in the exact desired proportions for optimum effectiveness, and sprayed upon any given objective. The necessity for electrically or gasoline driven pumps is eliminated inasmuch as the line pressure of the water which is to be mixed with the treating liquid is utilized as the means for operating the hydraulic motor, which in turn actuates a treating liquid pump in timed relation therewith to add a predetermined volume of treating liquid to a predetermined volume of the water exhausted from said motor, the pressure of the mixture of treating liquid and water-exhaust being sufiicient to form a good spray at the spray nozzle. In this manner, water under main pressure can be uti lized for the dual purpose of efiecting the admixture therewith of the treating liquid in a constant volumetric ratio, and as a vehicle for applying the treating liquid to an objective.

Accordingly, the principal object of the invention is to provide a liquid proportioning apparatus which will continuously deliver a mixture of at least two liquids in a predetermined constant volumetric ratio.

Another object of the invention is to provide liquid proportioning apparatus which can be adjusted to vary the relative volumes of the liquids handled thereby.

Another object of the invention is to provide liquid proportioning apparatus in which a predetermined volume of one of the liquids functions as a motivating fluid for producing admixture therewith of a predetermined volume of another liquid.

Still another object of the invention is to provide a combined proportioning and spraying apparatus which will continuously deliver a spray underpressure containing a mixture of two liquids in constant prescribed volumetric proportions.

A further object of the invention is to provide constant-proportion spraying apparatus which eliminates the necessity of pre-mixing measured volumes of a plurality of liquids in a tank prior to use.

A further object of the invention is to provide a portable spraying outfit in which water under main pressure can be utilized as an operating medium for a positive displacement type of hydraulic motor and in which the hydraulic motor actuates a pump for introducing a predetermined volume of treating liquid into the exhaust stream from the hydraulic motor.

A further object of the invention is to provide a combined proportioning'and spraying apparatus in which the treating liquid can be selectively delivered to either a high pressure spray nozzle for direct application, or mixed with a predetermined volume of an exhaust stream from a hydraulic motor and thus applied in diluted form.

A still further object of the invention is to provide a liquid pump of variable volumetric displacement.

Still another object of the invention is to provide a liquid proportioning apparatus including a hydraulic motor operated by one of the liquids to be proportioned, and a pump for another of the liquids to be proportioned, with the pump and hydraulic motor arranged so that the pump is automatically primed by the exhaust stream from the hydraulic motor.

Other objects and features of the invention will be apparent from the following description taken in conjunction with the accompanying drawings, -in whicht' Fig. 1 is a diagrammatic view, partly in section, illustrating a combined liquid proportiona portion of the pump associated therewith in cross-section;

Fig. 3 is a further enlarged left end elevational view of the pump shown in Figs. 1 and 2;

Fig. 4 is a vertical sectional view through the pump taken along the section-line 4-4 of Fig. 3;v and Fig. 5 is a view diagrammatically illustrating the manner in which the apparatus of Fig. 1 may be modified to include a three-way valve for optionally delivering the treating liquid directly to a high pressure spray nozzle for direct application, or for admixture with the exhaust stream from the hydraulic motor for applicationin diluted form.

. Referring now to Fig. l of the drawings, the numeral i9 generally identifies a conventional. trailer including a body H having a bottom wall 42, opposed side walls i3, and opposed end walls l4 (only one of which is shown). body H is mounted upon an axle having wheels ifi associated therewith for enabling-the trailer 19 tobe hauled from one job to another. A tank 11 rests upon the bottom wall l2 of the trailer and may be secured thereto in any desirable manner. The tank I! is provided with a filler opening 18 having a cap l9 and through which; opening the treating liquid 20 can be introduced intosaid tank. The treating liquid 20 can be liquid fertilizer, an insecticide, or any other liquid medium either devoid of or contain-. ing-a-material insolution or suspension. A drain valve 2| is connected with the bottom of the tank ll to-enable the liquid 20 to be drained from said tank, whendesired. A prime mover in the form of a hydraulic motor-22, which will be described in detail later, is conveniently mounted upon the top of the tank H- and includes a drivenshaft 23 connected with the upper end of a shaft 24 by a coupling 25; An agitator or bladed member 26 is secured to the lower end of'theshaft 24 and is adapted to stir or agitate the liquid 20, in the event that said liquid includes solids or suspended matter whichwould otherwise settle out on the bottom of the tank H.

A treating liquid pump 21 which. will, also be describedin detail later, is mounted upon one cylinder of the hydraulic motor 22 and includes an: intakehose 28 which extends into the tank I! to; a: point close to the bottom. of; said tank. Water under main pressure is supplied to the ThemotorgZ-Z through a. hose 29 and exhausts. from I saidimotorthrough a fluid: distribution plate 30. Therplate-3fl is connected with the: lower branch 31 of a cross-fitting 32. One of the side branches 3-3 of: the cross-fitting 32 is connected with one end of a hose 34', the opposite end of said; ,hosebeing connected with the discharge side; of the pump 2-1. The other side branch 35 of the .cross fitting '32 isv connected" to one end of. a hose. 36 and the opposite end of said hose is connected with a conventional nozzle-'31 which preferably forms a fan-shaped spray. A shutoff. valve 38 is connected in the hose. 35 adjacent the nozzle 31. The upper branch 39 of thecrossfitting 32 is connected with avery sensitive conventional or suitable vacuum breaker or antisiphonvalve 40 for preventing siphoning of the treating liquid 20 from the tank l1 through the hose- 36 when the apparatus is not in use, and particularly in the event that the operator leavesthe nozzle 3'! on the ground and neglects to close the shut-off valve 38., A. spaceiil. in the trailer i0 between one of the sidewalls l3 and the adjacent side wall of the tank I1 is. adapted to providev storage space for cans of treating liquid and extra lengths of hose (not shown), etc., and the hoses'29 and 36 when not in use.

The details of construction of the hydraulic motor 22 are best shown in Fig. 2 from which it Will be noted that said motor includes housing sections 43' and 44 secured together by bolts 45. Each of the housing sections 43 and 44 contains a ball bearing 46 serving as an antifriction mounting for the driven shaft 23. Packing rings 41 serve as seals around the shaft 23 to prevent. the escape of lubricant from a lubricant chamber 48v formed in the housing section" 43 and closed. by the housing section 44'.

The motor shaft 23 is provided with. an enlarged, eccentric portion 49' located in the chamber. 48 between the ball bearings 45. A roller bearing. 50' surrounds the eccentric portion 49 and a wear ring 5! surrounds the roll-er bearing 58. The housing section 43 includes, say, five radially extending cylinders. Two of these cylinders. are shown in Fig. 2 and identified by the numerals 52 and 52%. respectively. Each of the cylinders 52 and 52. includes a bore 53 communicating at its inner end with the chamber 48 through openings 54 formed in a transverse wall 55 at the inner end of said bore. Each of the walls" 55' carries a boss 56v which slidably receives a rod 51 secured to a piston 58. The inner. ends of the rods 51 engagethe outer periphery of the wear ring 5!. The-cylinder 52 terminates in a circular flange 59,, and a flexible diaphragmfill overlies theflange and the head ofthe piston 58. A cover Glucooperates with the diaphragm 60 to form a closure for the cylinder 52. Bolts 62 secure the cover GI and diaphragm 68 to the flange 59. The cover 61: is recessed to provide a chamber 53 for operating fluid disposed on the outer side of the diaphragm 60.

A generally cup-shaped valve housing 65' is suitably mounted upon the upper end of the housing section 43and contains a chamber 66 into which. water under pressure from the hose 29 is introduced, the hose 29 being connected to the housing-65 by a fitting 29 (Fig. 1). The fluid distribution plate 30, previously mentioned, is suitablysecured to the valve housing 65 and forms a closure for. the upper end thereof. The chamber 66 contains a rotary valve 6'5, which is drivinglyinterconnected at 58' with an extension 69 of. the motor shaft-23 A packing 10* carried. by the valve housing forms av seal around the extension 69'. The rotary valved! includes an exhaust'port ;'H* which, in one operative position thereof, is adaptedto establish communication between-.a-port 12' and an exhaust passage or outlet; T3 inthe fluid distribution plate 30; Apipe nipple 14 connects; the passage 13 with the lower branch 31 of the cross-fitting 32. The port 12- is. continuously connected with the chamber-63- in, the cover 5|- by a tube 15 secured at one end thereof: to the fluid distribution plate 30 by; a fitting; 1'6 and secured at its opposite end to the cover Blbya-similar fitting Tl. Hence, when the rotary valve 61 is in the positionshown, operating; fluid is exhausted from the chamber 63 through the tube.- 75, port 12 in the distribution plate--30, exhaust port 1| in the rotary valve 6-7, and; the. exhaust passage E3; in said distribution plate, and thence into the cross-fitting 32.

. 'Therotary valve. B1 is also I provided withapressure port -18, which always communicates with thechamber 65, and when-said valve the position shown in Fig. 2 registers with a port 79 in the distribution plate 30. A tube 89 has one end thereof in communication with the port 79 and is connected at said end to the distribution plate 30 by a fitting BI, and the opposite end of said tube is connected by a fitting 82 with a modifled cover 83 forming a closure for the cylinder 52*. A flexible diaphragm 84 is arranged between the cover 83 and a flange 59 to form a closure for the cylinder 52*. Bolts 85 secure (the cover 83 and diaphragm 84 to the flange 59 Hence, at about the time that the rotary valve 67 is exhausting operating fluid (water) from the chamber 63, as above described, operating fluid (water) under pressure is admitted from chamber 66 through the pressure port 78, and port 79 and tube 80 into a pressure chamber 86 formed within the cover 83. Thi liquid will act upon the diaphragm 84 and urge the piston 58 in the cyl-- inder 52 toward the right, as viewed in Fig. 2, to impart an impulse through the rod 57 to the wear ring 5|. Such impulses from the rods 57 in the several cylinders will effect positive and continuous rotation of the motor shaft 23, the shaft 23 in turn effecting rotation of the rotary valve 67 to admit operating liquid into and to exhaust operating liquid from the several pressure chambers 63 and 86, in predetermined succession, all in a manner well understood in the art. The volume of water introduced into each chamber 63 to effect inward movement of its associated piston is constant, and this is also true of the water introduced into chamber 88, inasmuch as these chambers are all devoid of air pockets and must be completely filled to move the pistons 58 through 3 the full length of their work stroke. Hence, the exhaust stream from the motor contains a pre determined volume of water for each revolution of the shaft 23.

The cover 83 serves as a base for the treatingliquid pump 27, previously referred to. The cover 83 carries a circular flange 87, and a hard rubber pump body 88 is secured to said flange by a pluralityof bolts 89, a flexible diaphragm 98 being disposed between said flange and'body. The cover 83 has a transverse Wall 9I forming one end of the chamber 86 and is provided with a central boss 92. The boss 92 has a bore 93 which slidably receives a piston rod 94. A packing ring 95 forms a seal between the bore 93 and the piston rod 94 and prevents the escape of operating fluid from the pressure chamber 86. A dished abutment plate 96 is mounted upon the inner end of the rod 94 and a Lucite piston or liquid displacement member 97 is mounted upon a reduced threaded portion 98 of the rod 94. The reduced rod portion 98 extends through the diaphragm 90, and a diaphragm supporting plate 99 is mounted on said reduced portion between a shoulder I00 and the adjacent side of said diaphragm. v

The cover 83 is provided with an internal thread IOI and a ring I02 is disposed between the diaphragm supporting plate 99 and the transverse wall 9I and is threaded at its outer periphery for engagement with the threads IOI. The cover 83 is further provided with at least one elongated slot I03 in the zone of the threads IOI, and the ring I02 is provided with radially extending holes I94 spaced apart a distance less than the circumferential length of the slot. I03, so that said ring can be axially adjusted within the cover 83 by the insertion of a pin (not shown) through the slot I03 into the holes I04 for effecting rotation of said ring. A compression spring I05 is disposed between the transverse wall 9! and the abutment plate 96 and is arranged to normally urge the diaphragm supporting plate 99 into engagement with one side of'the ring I02, and in this manner limit the return or suction stroke of the diaphragm and the piston 97. Thus, it will be apparent that the ring I92 can be adjusted to vary the stroke 01' displacement of the piston 97, and therefore, the volume of liquid pumped by said piston, without requiring disassembly or removal of any parts of the pump 27.

The pump body 88 (Fig. 4) contains a pumping chamber I 06 in which the piston 97 is reciprocable. An inlet passage I07 communicates with the lower portion of the chamber I06 and is en-.

larged as indicated at I08 for the reception of an inverted rubber cage I09 and an annular rubber member II 9 which serves as a seat for a spherical glass ball I I I cooperating with theseat IIO to provide an inlet check valve generally identified by the numeral I I2. A tube I I3 of corrosion-resistant metal is soldered to a brass fitting II4,- and a rubber gasket H5 is disposed between the fitting H4 and the pump body 88. Screws H8 (Fig. 3) are threaded into metal inserts I I7 molded into the hard rubber pump body 88 and secure'said fitting to said pump body. The hose 28, which extends into the treating liquid 20, is secured at its upper end to thetube ll3byaclampll8.

An outlet passage I I9 in the pump body 88 is vertically aligned with the inlet passage I07 and communicates with the upper portion of the pumping chamber I86. The passage II 9 i enlarged at I20 for the reception of an annular rubber member I2I serving as a seat for a spherical glass ball I22. An inverted'cup-shaped rubber cage I23 is disposed in the enlarged portion I20 of the passage I2I and receives the ball I22, which cooperates with the seat I2I to function as an outlet check valve generally designated I24. The flow of treating liquid 20 through the cages I89 and I23 is facilitated when the balls- II- and I22, respectively, are unseated, by the formation in said cages of a plurality of longitudinally extending grooves I25. One end of a corrosionresistant metal tube I26 is soldered to a brass fitting I27, and a rubber gasket I28 is disposed between the fitting I27 and the pump body 88. Screws I29 (Fig 3) are threaded into metal inserts I30 molded into the pump body 88 and secure said fitting to said pump body. One end of the hose 34 is secured to the tube I26 by a clamp I3I,' so that'constant communication is established between the cross-fitting 32 and the outlet or discharge side of the pump 27.

One of the important" features of the solution pump 27 (Fig. '4) is that it is automatically primed upon operation of the hydraulic motor 22. by by-passingv liquid around the outlet check valve I24. The priming of the pump 27 is effected through a-small passageway I32 extendin transversely through the cage I23 and constantly communicating with one end of a passageway I33 opening into the" pumping chamber I06. Assumingthat the pump 21 requires priming, s the motor-operating liquid is discharged into the cross-fitting 32 from the hydraulic motor 22, a

portion-thereof. will flow by gravity through the hose 34 into the cage I25 and, thence, through the passages I32 and I33 into the pump chamber I06 to facilitate the creation of the necessary suction to raise the liquid from the tank I! into the pump chamber I06 through the hose 28. upon aeemooz the return stroke. of the diaphragm 9 and piston 91 The pump 21 is given one work-stroke for each revolution of the motor shaft. 23, i'. e., the pump work-stroke corresponds to the work-stroke of the piston 58 in the cylinder 52 However the stroke of the piston 58 islonger than that or the piston 97 because of the lost motionv resultin from the initial spacing of the. abutment plate; 96 from. the. diaphragm 84. Thus, the piston 91 is: not moved toward the left, as viewed in Fig. 4", until the abutment plate 96 is engaged by the diaphragm 84, whereupon it will positively displace a predetermined volume of liquid '20 from the pumping chamber I06, resulting in a. forced opening of the outlet check valve I24 and. the discharge of the displaced liquid into the hose. 34. As the piston 9'! and diaphragm 90 are returned toward the right by the spring I05, the ball I22 will instantly seat and the suction created in the:

. chamber I06 will lift the ball III-from its seat,

thusopening the inlet check valve I I2, and draw enough treating liquid through the hose/28 into the pumping chamber I00 to completelyfill the same. The passage I32 is too small to interfere with the creation of a strong suction in the chamber I06 during the return stroke of the piston 31. The next work-stroke of the piston; 91. will displace a predetermined volume of liquid *as the pumping cycle is repeated.

The treating liquid 20 thus: pumped intqthe hose- 34 is forced into the cross-fitting 32 into which the water-exhaustfrom all of the cylinders 52---5-2 of the motor 22 is also forced, andjthe: waterand liquid 20 are caused to mix to some. extentv in. the cross-fitting: 32 and further and complete mixing thereof is'efie'cted asv the liquids areforced' through the. hose 36. Tests with transparent: hose and. colored liquids have; shown that complete and; thorough .intermixturev .oI the" two liquids is attained in the. hose 36 within. a'., few feet of the. cross-fitting 32:, so that the two liquids are: properly intermixed in precise proportions before they reach thespray nozzle 31.

In. spraying. a certain liquid ,fertilizengfor, example; about twenty-five-parts-oi waterare mixed with. one part of said liquid fertilizer. Onei operativeiorm of hydraulic motor 22 has five cylholders. and a. piston stroke of /2. The pump 2I.is-sodesigned that a stroke-of about A of the piston rod 94- of'the pump 21 will give a twentyfive to one ratio: of water totreating liquid.

In the normal use of theapparatus; and-with the-hydraulic motor 22 in; operation, the auto-- maticyacuum: breaker-valve 40 is held tightly closed by the-pressure of the liquids in the crossfitting 32. However, in the. event that theoperator' should leave the nozzle end of the hose 3b in a position lower than the: level of the treating liquid 20' in the tank: I'I,= such treating liquid would normallysiphon out through the hose 33 resulting-in a. loss of. the treating liquid andidamage to the vegetation being: treated as a: result: of the strong charge of treating liquid'having been either introduced into the: hose 36 or else having. drained from said hose: onto the lawn, etc; but. such loss and damageare positively prevented by the vacuum breaker" 4 0, which instantly opensthe cross-fitting 32 to the atmosphere in the. cventthat the slightest suction condition is; created in the hose 36'. The opening of the cross- .fitting 32 to the/atmosphere. of courserprecludesthe siphoning of anyl'iquidi 20 Outer the. tank I 1 when themotor 22 is" inactive.

The hydraulic motor: 22 can be provided with.

more than five cylinders. and. if. more. than. two liquids: are to bemixed in predeterminedproportions, a. second cylinder of. the motor22-may be.

modified to operate a pump (not. shown) but similar tothe pump 21 to pump a third liquid so that. itis discharged and mixes with the exhaust-w-ater and the treating liquid from the pump 21 prior to delivery to a spray nozzle or other destination.

Fig. 5- diagrammatically illustrates one way in which the apparatus shown in Fig. 1 may be modified so that. it can be optionally utilized to deliver a treating liquid of suitable concentration directly to a high pressure spray nozzle for direct application, or for admixture with the exhaust liquid from the hydraulic motor and applied in diluted form. Thus, the discharge side of the pump 21 is shown connected with the inlet of a conventional three-way valve I40 by a conduit. I4I. One of the outlets of the three-way valve I40 is connected by a conduit I42 with the side branch 33' of the cross-fitting 32.v The other outlet of the three-way valve I40 is connected with a hose I43 having a high pressure nozzle I44 and a shut-off valve I45 connected therewith. A sensitive, automatic vacuum breaker valve I46; similar to the valve 40,, is preferably connected between the three-way valve I40 and the hose I43, in order to prevent any possible siphonin of the treating liquid out of the tank. I! through the hose I43.

The three-way valve I40 includes a disc I4] provided with an arcuate port I48 which, when disposed in the position shown in Fig. 5, establishes communication between the conduit I4'I' at the discharge side of the pump 2''! and the hose I43, so that the treating liquid is not mixed with the water exhausted from the motor 22 inv the cross-fitting 32, but on the other hand, the treating liquid is delivered under pressure. for direct application by the nozzle I44. A handle I40 is connected with the disc I41, and it will. be.

apparent that when said handle is turned counterclockwise through an angle of the arcuate port I48 will then establish communication between the conduits I4I and I42. This will prime the pump 21 if that is all that is desired, or the port I48 may be allowedto remain in such position and the treating liquid will be pumped. into the cross-fitting 32 and mix with the water-exhaust for spray application through the hose 36..

When the disc I4? is in the position shownin Fig. 5, the water used to operate the motor 22 toeffect driving of the pump 21 will exhaust as heretofore: into the cross-fitting 32,. but will discharge alone through the hose 36 as waste; Thus, the disc I41 of the three-way valve I40 is adapted to be selectively positioned to effecteither delivery of the treating liquid alone for direct application, or a mixing of the treating liquid with the water discharged from the motor 22 to form a spray containing the treating liquid.

in a predetermined ratio to the water'employed. to drive the motor. 22.

It will be apparent that, in lieu of employing the three-way valve I40, the delivery of thepumped. treating liquid to a. high pressure nozzle can be. efiected with: the apparatus. shown in: Figs. 1 to 4, by simply disconnecting the hose 34. from the pump 21 and hydraulic motor 22., plug-- gingj the branch 33 of. thecross-fitting. 32' and. attaching a. nozzle and, suitable. length of. hose: (not shown). to thepump' discharge tube I.2.6.. How-- even. such arrangement has the disadvantage of preventing exhaust-water from the motor 22 from reaching the pump 2'! to prime said pump.

This is not serious because the pump 21 can be primed by introducing liquid into the tube I26 prior to connecting the high pressure nozzle and hose thereto.

It will be understood that the liquid proportioning apparatus comprising the motor 22 and pump 21 is generally useful and not limited to use with spraying equipment, although such specific use has proved highly satisfactory.

It will also be understood that various changes may be made in the details of construction and in the arrangement of the parts of the proportioning and spraying apparatus disclosed herein,

without departing from the spirit of the invention or the scope of the annexed claims.

I claim:

1. A liquid proportioning apparatus, comprising: a multi-cylinder, positive displacement, hydraulic rotary motor operable by an operating liquid under pressure, each of said cylinders hav-' ing a piston therein, said hydraulic motor having a common exhaust outlet for used operating liquid from the several cylinders of said motor; a positive displacement pump for pumping a prescribed volume of a treating liquid, said pump including an inlet adapted to be connected with a supply of said treating liquid, and an outlet, said pump including a pumping element arranged to be actuated by the piston in one cylinder of said hydraulic motor in timed relation therewith, said pumping element normally being spaced from said piston and free from connection thereto, but disposed so that it is actuated during only a part of the stroke of said piston; conduit means interconnecting the outlet of said pump. and said exhaust outlet of said hydraulic motor to efiect mixing of the pumped treating liquid and the exhaust liquid; and a discharge conduit for the mixed liquids connected with said last-mentioned conduit means.

2. A liquid proportioning apparatus, comprising: a multi-cylinder, positive displacement, hydraulic motor operable by liquid under pressure, said hydraulic motor having an outlet for exhaust liquid; a positive displacement pump for pumping a treating liquid, said pump having. an inlet adapted to be connected with a supply of treating liquid, and an outlet, said pump being arranged to be actuated by said hydraulic motor in predetermined timed relation therewith; and means establishing communication between said pump outlet and said hydraulic motor outlet for automatically priming said pump with exhaust liquid from said hydraulic motor. immediately upon starting of said hydraulic motor.

3. A liquid proportioning apparatus, comprisadapted.to...be connected with a-supply ofsaid' treatingliquid, and an outlet, said pump being.

mounted upon one of said cylinders of said hydraulic motor and having a pumping element arranged to be actuated by thepiston in the said hydraulic motor so that the exhausted oper ating liquid and pumped treating liquid are mixed together in predetermined proportions.

4. A liquid proportioning and spraying apparatus, comprising: a hydraulic motor including a plurality of cylinders, each containing a piston and requiring a predetermined volume of liquid to eiTect movement of the piston through its working stroke, said hydraulic motor having a common exhaust outlet for operating liquid from all of said cylinders; a positive displacement pump for pumping a prescribed volume of a treating liquid, said pump having an inlet adapted to be connected with a supply of said treating liquid, and an outlet, said pump being mounted upon and forming at least in part a closure-for one end of one of said cylinders of said hydraulic motor and arranged to be actuated by movement of the piston in the cylinder associated therewith; conduit means interconnecting the outlet of said pump and said exhaust outlet of said hydraulic motor so that the exhausted operating liquid and pumped treating liquidare ment of the piston through its Working stroke,

said hydraulic motor having a common exhaust "outlet for operating liquid fromall of said cylinders; a positive displacement pump for pumping a prescribed volume of a treating, liquid, said pump having an inlet adapted to be connected with a supply of said treating liquid, and'an outlet, said pump being mounted upon one of said cylinders of said hydraulic motor and arranged to be actuated by movement of the piston in the cylinder associated therewith and at least in part forming a closure for one end of said one cylinder; means for varying the stroke of said pump and, hence, the volume of treating liquid pumped by said pump; and conduit means interconnecting the outlet of said pump and said exhaust outlet of said hydraulic motor so that the exhausted operating liquid and pumped treating liquid are mixed together in predetermined proportions.

7. A liquid proportioning and spraying apparatus, comprising: a multi-cylinder, positive displacement, rotary type of hydraulic motor operable by water under pressure, said hydraulic motor having an outlet for exhaust water; a positive displacement pump for pumping a treating liquid, said pump having an inlet and an outlet and being mounted upon one end of one of said "cylindersof said hydraulic .motor and arranged to be actuated thereby, said pump forming at least in part a closure for said end of said onecylinder;

cylinder associated therewith only during movement of said piston in a direction toward said pump; andconduit means interconnecting the a tank adapted, to contain. a treating'liquid; a

supply conduit for conducting liquid from said .tank to the inlet side of said pump; conduit means interconnecting the outlet of said pump and'th'e outlet ofv said hydraulic motor so that the exhaust water and said pumped treating liquid are mixed together therein; and a -spraynoz zl 'e connectedwith said conduit means.

a. A liquid' proportioning and spra ing spat 111 ratus, comprising: a multi-cylinder, positive displacement, rotary type of hydraulic, motor operable by water under pressure, said hydraulic motor having an outlet for exhaust water; a positive displacement pump for pumping a treating liquid, said pump having an inlet and an outlet and being mounted upon one end of one of said cylinders of said hydraulic motor and'arranged to be actuated thereby; a tank adapted to contain a treating liquid, said motor including a driven shaft; an agitator in said tank driven by said shaft ,for agitating said treating liquid; a supply conduit for conducting liquid from said tank to the inlet side of said pump; conduit means interconnecting the outlet of said-pump and the outlet of saidhydraulic motor so that the exhaust Water andrsaid pumped treating liquid are mixed together therein; and a spray nozzle connectedwith saidconduitmeans.

:9. A liquid proportioning apparatus, comprising: a multi-cylinder, positive displacementhydraulie motor operable by water under pressure, said'motor having a common exhaust outlet for the water from all of saidcylinders; a positive displacement pump for pumping a, treating liquid, said pump including an outlet, and an inlet adapted to be connected with a supply of said treating liquid, said pump being mounted upon one end of one of said cylinders of said hydraulic motor and arranged to be actuated thereby, said pump including a body having a pumping chamber, inlet, and outlet check valves, and priming passage means interconnecting said pump outlet andsaid pumping chamber to establish a by-pass around said outlet check valve; a multi-way fitting having one branch thereof connected with the exhaust outlet of said motor; and means connecting another branch of said fitting with said outlet of said pump so that exhaust water can .flow through said conduit to said pump to effect automatic priming thereof upon starting of said ,motor. I

10. A liquid proportioning and spraying apparatus, comprising: a multi-cylinder, positive displacement, hydraulic motor operable by water hydraulic motor and arranged to be actuated thereby; a tank adapted to contain a treatin liquid; a conduit ;for conducting treating liquid from said tank to said inlet of said pump; a cross-fitting having one branch thereof connected with said outlet of said motor and another branch thereof connected with the outlet side of said pump, so that the exhaust water and the treating liquid commingle in said cross-fitting; a hose connectedwith another branch of said cross-fitting; a spray nozzle attached to said hose; and an anti-Syphon valve connected with the remaining branch of said cross-fitting for preventing syphoning of said treating liquid from said tank through said hose when said hydraulic motor is inactive.

12. A liquid proportioning and spraying apparatus, comprising: a multi-cylinder, positive displacement, hydraulic motor operable by water under pressure, said motor having an exhaust outlet for used water; a positive displacement pump for pumping a treating liquid, said pump having aninlet and anoutlet and being mounted under pressure, said motor having a common exhaust outlet for the water from all of said cylinders; a positive displacement pump for pumping a treating liquid, said pump including an outlet, and an inlet adapted to be connected with a supply of said treating liquid, said pump being-mounted upon one end of one of said cylin-r ders of said hydraulic motor and arranged to be actuated thereby, said pump including a body having'a pumping chamber, inlet and outlet check valves, and passage means interconnecting said pump .outlet and said pumping chamber to establish a by-pass around said outlet check valve;

a multi-way fitting having one branch thereof connected with the exhaust outlet of said motor; means connecting another branch of said fitting with said outlet of said pump so that exhaust Watercan flow through said conduit to said pump to efiect automatic priming thereof upon start ing of said motor; a hose connected with another T branch of said fitting; and a spray nozzle attached to said hose. v

11. A liquid proportioning and spraying appa ratus, comprising: a multi-cylinder, positive dis placement, hydraulic motor operable by Water under pressure, said motor having an exhaust outlet for used water; a positive displacement pump for pumping a treating liquid, said pump having an'inlet and an outlet and being-mounted upon one end of'one of said cylinders oisaid.

upon one end of one of said cylinders of said hydraulic motor and arranged to be actuated thereby, said pump also including means for priming the same; a tank adapted to contain a treating liquid; a conduit for conducting treating liquid from said tank to the inlet side of said pump; a cross-fitting having one branch thereof connected with said outlet of said motor and another branch thereof connected with said outlet of said pump, so that, the exhaust water and the treating liquid commingle in said cross-fit.-

, .ting, said latter connection providing means for making the exhaust water available to said prim- ,ing means for priming said pump; a hoseconnected with another branch of said cross-fitting; a spray nozzleattac'hed'to said hose; and anantisyphon valve connected with the remaining branch of said cross-fitting for preventing syphoning of said treating liquid from said tank through said hose when said hydraulic motor is inactive.

'13. A liquid proportioning apparatus, comprising: a hydraulic motor including a plurality of cylinders, each containing a piston and requiring a predetermined volume of liquid to effect the movement of said piston through its working stroke, said hydraulic motor having a common exhaust outlet for operating liquid from all of said cylinders; a positive displacement pump for pumping a prescribed volume of a treating liquid, said pump being mounted upon one end of one of said cylinders of said hydraulic motor, said pump including a body having a pumping chamber, a pump piston in said pumping chamber arranged to be actuated in one direction by movement of the piston in the motor cylinder associated therewith, means for effecting a return of said pump piston, said body having an inlet passage and an outlet passage communicating with said pumping chamber, said inlet passage having an inlet check valve and being adapted to be connected with a supply of treating liquid, said outlet passage having an outlet check valve, said body also'having a passageway interconnecting said outlet passage and said pumping chamber and providing a by-pass around said outlet check valve; and conduit means inter.- connecting said outlet passage of said pump and said exhaust outlet of said hydraulic motor so that a portion of the exhaust operating liquid can by-pass said outlet check valve and prime z'said pump-when said motor is started, and,;upi2n 13 pumping operation of said pump, to efiect admixture of the pumped treating liquid and said exhaust operating liquid.

14.,Aliquid proportioning and spraying apparatus, comprising: a hydraulic motorincluding a shaft, a plurality of cylinders arranged radially with respect to said shaft, a pistonin each of saidcylinders, a diaphragm at the outerend of eachj'of said pistons, a cover member overlying all but one of said diaphragms and providing a pressure chamber for operating fluid outwardly of said diaphragms; a pump overlying said one diaphragm and including a cover portion providing a. pressure chamber outwardly of said one diaphragm, an inlet adapted to be connected with a sourceof treating liquid, an outlet, and a piston adaptedito be reciprocated by the piston in the cylinder associated with said one diaphragm; means 'for successively introducing water under pressure into said pressure chambers and for successively exhausting Water from said pressure chambers, said hydraulic motor having acommon outlet for receiving the exhaust-water from all of said pressure chambers; and conduit means connecting the outlet of said pump with said common exhaust outlet, so that said pumped treating; liquid and said exhaust-water are mixed together in constant proportions.

15. A liquid proportioning and spraying apparatus, comprising: a hydraulic motor including a' plurality of cylinders, each containing a piston and requiring a predetermined volume of fluid to. efiectmovement of the piston through its working stroke, said hydraulic motor having a common exhaust outlet for operating fluid from all of {said cylinders, a positive displacement pump for pumping a prescribed volume of a treating liquid, said pump having an inlet adapted to be connected with a supply of said treating liquid,'fand an outlet, said pump being mounted upon one of said cylinders of said hydraulic motor and arranged to be actuated by movement of the piston in the cylinder associated therewith; a three-way valve; a conduit connecting the outlet of said pump with an inlet of said three-way valve; a conduit connecting an outlet of said three-way valve with said exhaust outlet; a spray nozzle and a conduit connected with said exhaust outlet; and a high pressure nozzle and a conduit connected with an outlet of said threeway valve, said three-way valve being arranged to selectively deliver the pumped treatingliquid discharged from said pump to either said high pressure nozzle for direct application, or to mingle with the exhaust operating liquid to be applied in predetermined, proportionately diluted form by said first-mentioned spray nozzle.

16; A pump comprising: a cover member adapted to be secured to one end of a cylinder of a prime mover; a pump body mounted upon said cover and having a pumping chamber, inlet and outlet passage means communicating with said pumping chamber, and a check valve in each of said passage means; a piston rod; a piston carried by one end of said rod and movable in saidpumping chamber by a movable element of said prime mover; a transverse wall in said cover member arranged to form one end of said pumping chamber and to serve as a guide for said rod; an abutment carried by the opposite end of said rod on the side of said transverse wall remote from said piston; and means constantly urging said rod in one direction.

17. A pump as defined in claim 16, in which passage means is provided for by-passing liquid around the outlet check valve and into the pumping chamber to effect priming of said pump.

18. A pump comprising: a cover member adapted to be secured to one end of a cylinder of a hydraulic motor; a pump body having a pumping chamber, inlet and outlet passage means communicating with said pumping chamber, and a check valve in each of said passage means; a diaphragm disposed between said pump body and cover member; a piston rod having one end thereof extending through said diaphragm and into said pumping chamber; a piston carried by said one end of said rod; a transverse wall in said cover member arranged to form one end of said pumping chamber and to serve as a guide for said rod; an abutment plate carried by the opposite end of said rod on the side of said transverse wall remote from said diaphragm; a return spring between said abutment plate and said transverse wall constantly urging said rod in one direction; and a'ring threadedly engaged with said cover member and arranged to limit the movement of said piston in said one direction, said ring being provided with a plurality of circumferentially spaced holes, and said cover member being provided with an elongated opening registering with said holes and affording access to said ring for adjustment thereof to vary the working stroke of said pump, without requiring disassembly of any parts of said pump.

19. A pump comprising: a cover member adapted to be secured to one end of a cylinder of a hydraulic motor; a pump body having a pumping chamber, inlet and outlet passage means communicating with said pumping chamber, and a check valve in each of said passage means; a diaphragm disposed between said pump body and cover member; a piston rod having one end thereof extending through said diaphragm and into said pumping chamber; a piston in said pumping chamber carried by said one end of said rod; a transverse wall in said cover member arranged to form one end of said pumping chamber and to serve as a guide for said rod; an abutment plate carried by the opposite end of said rod on the side of said transverse wall remote from said diaphragm; a return spring between said abutment plate and said transverse wall constantly urging said rod in one direction; and an adjustable means limiting the movement of said piston in said one direction to thereby limit the length of the working stroke of said piston.

DONALD G. GRISWOLD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 781,678 Richwood Feb. 7, 1905 1,023,583 Morgan Apr. 16, 1912 1,720,326 Halstead July 9, 1929 1,726,083 McLaughlin Aug. 27, 1929 2,009,890 Jones July 30, 1935 2,018,153 Schulze Oct. 22, 1935 2,128,263 Ofeldt Aug. 30, 1938 FOREIGN PATENTS Number Country Date 2,501 Great Britain of 1884 

